Start Activity with UI updated from notification if service running - android-service

Question

I'm making kind-of an audio player. Currently I have a MediaPlayer running in the Activity itself (which I know is bad). There is a SeekBar on the screen which gets updated as the music plays, like so:
private Runnable mUpdateTimeTask = new Runnable() {
public void run()
{
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
songTotalDurationLabel.setText("" + utils.millisecondsToTimer(totalDuration));
songCurrentDurationLabel.setText("" + utils.millisecondsToTimer(currentDuration));
int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
songProgressBar.setProgress(progress);
if(mp.isPlaying())
mHandler.postDelayed(this, 100);
else
mHandler.removeCallbacks(mUpdateTimeTask);
}
};
Once the user presses the back button or kills it from the recent apps list, the music stops.
Now I want the music to run in the background, so looking around the internet I found to run it in a Service, and calling startService() from Activity. Also I have a notification come up when music is playing and removed when it is paused.
I understand from a service I'll get the music to play even when app gets closed. But what I didn't understand is, if the user taps on the notification given the service is running, the activity restarts with the SeekBar at progress = 0.
How do I get the UI to update the SeekBar to the correct value from the Service after the activity restarts?

Answer 1

Figured it out!
The solution is to get the running services using the ActivityManager and find your service like this
private boolean fooRunning()
{
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for(RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE))
{
if("com.name.packagename.foo".equals(service.service.getClassName()))
{
return true;
}
}
return false;
}
If this method returns true, bind to the service and get the current position from the MediaPlayer object
public void bindToService()
{
if(fooRunning())
{
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
serviceExists = true;
}
else
serviceExists = false;
}
private ServiceConnection mConnection = new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName className, IBinder serviceBinder)
{
bar binder = (bar) serviceBinder;
mService = binder.getService();
if(serviceExists)
{
int getProgress = mService.mp.getCurrentPosition();
// mp is the MediaPlayer object in the service
seekbar.setProgress(getProgress);
}
}
#Override
public void onServiceDisconnected(ComponentName className)
{
}
};
The Service class is like this:
public class foo extends Service
{
private MediaPlayer mp = new MediaPlayer();
private final IBinder mBinder = new bar();
public class bar extends Binder
{
public foo getService()
{
return foo.this;
}
}
#Override
public IBinder onBind(Intent intent)
{
return mBinder;
}
}
Hope this helps someone!